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Security report for holidu.at

Holidu GmbH · Hospitality · Austria

Medium risk. 5 critical or high findings in GDPR outside view, Security headers and 1 other check.

Security score

74/100

Risk levelMedium

0–100, higher is better. How it is calculated

Holidu GmbH operates a professional online platform specializing in vacation rental properties across Europe, offering a wide range of family-friendly, pet-friendly, and amenity-filtered holiday homes. The company positions itself as a trusted specialist in the European holiday rental market, providing verified listings and a user-friendly booking experience. The website is well-designed, mobile-optimized, and rich in content, targeting consumers seeking vacation accommodations with various preferences. Technically, the site leverages modern JavaScript frameworks, tracking technologies, and adheres to GDPR compliance with clear privacy and cookie policies. Security posture is strong with HTTPS enforcement and security headers, though explicit security policies and incident response information are not publicly available. The absence of WHOIS data limits domain trust assessment, but the overall digital presence and branding indicate a legitimate and established business. Strategic recommendations include enhancing transparency on security and incident response, and publishing vulnerability disclosure information.

Scanned

This is an earlier scan of holidu.at. View the latest report

NIS2 and GDPR posture

GDPR outside view
33/ 100 · High
Checks completed
7of 7

NIS2 Art. 21(2)

  1. (a) Risk analysis and security policies: Not visible from outside
  2. (b) Incident handling: One indicator
  3. (c) Business continuity, backups and crisis management: Not visible from outside
  4. (d) Supply chain security: Not visible from outside
  5. (e) Secure acquisition, development and maintenance, including vulnerability handling: Partly checked
  6. (f) Assessing the effectiveness of security measures: Not visible from outside
  7. (g) Cyber hygiene and security training: Not visible from outside
  8. (h) Cryptography and encryption: Partly checked
  9. (i) HR security, access control and asset management: One indicator
  10. (j) Multi-factor authentication and secured communications: Not visible from outside

This scan rated NIS2 with an earlier keyword method that is no longer shown; rescan for the per-article view. Risk management, continuity, supply chain, training, MFA, management oversight (Art. 20) and incident reporting (Art. 23) need internal evidence, and Guard cannot tell whether NIS2 applies to this organisation.

GDPR is indicative only, based on publicly visible signals: Articles 7, 12, 13 and 32 of Regulation (EU) 2016/679 and Article 5(3) of the ePrivacy Directive. Not a certification or legal assessment.

Priority findings

5 findings rated critical or high. Fix these first.

  1. GDPR outside view

    These are the privacy signals visitors and data protection authorities look for under GDPR.

    • Critical

      EU business without adequate privacy measures

      EU businesses are subject to strict GDPR requirements

      What to do: Implement comprehensive GDPR compliance including privacy policy, cookie consent, and data protection measures

    • High

      No Cookie Policy found

      GDPR requires clear information about cookie usage

      What to do: Add a dedicated cookie policy explaining cookie usage and purposes

    • High

      No Cookie Consent Banner found

      GDPR requires explicit consent for non-essential cookies

      What to do: Implement a cookie consent banner that appears on first visit

  2. Security headers

    Security headers are instructions your web server sends to every visitor’s browser. Missing ones leave visitors more exposed to attacks such as clickjacking and injected scripts.

    • High

      Missing Content-Security-Policy header

      Controls resources the browser is allowed to load

      What to do: Implement a Content-Security-Policy appropriate for your application

      • ASVS V3.4.3
      • OWASP Secure Headers: OWASP Secure Headers Project recommends Content-Security-Policy: default-src 'self'; form-action 'self'; base-uri 'self'; object-src 'none';…

  3. SSL/TLS

    TLS encrypts the connection and proves the site is really yours. Weak or expiring certificates trigger browser warnings and put traffic at risk.

    • High

      Weak Protocols Supported

      Server supports weak protocols: TLSv1.1

      What to do: Disable TLS 1.0, TLS 1.1, and all SSL versions

      • CWE-327
      • OWASP A04:2025
      • ASVS V12.1.1

Need hands-on remediation? Email guard@offseq.com

Keep watching holidu.at

This scan found 16 issues across 6 checks. Monitoring re-runs those checks daily, emails you when something material changes and records each fix, so you can show progress.

Daily monitoring

Recommended

€25per month

  • TLS certificates and expiry
  • DNS records
  • SPF, DKIM and DMARC
  • Security headers
  • GDPR and NIS2 posture
  • Exposed services
  • Third-party trackers
  • Security score drift

Email alerts on material changes and an exportable JSON history of every change.

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Results by check

Each check with its score, findings and the evidence it collected.

How this score is calculated

The security score runs 0–100, higher is better. It is the plain average of the security checks that completed in this scan, each counted equally. A check that could not run is left out: it counts neither as a pass nor as a fail.

Counted in this score

SSL/TLS
77
Security headers
70
Email security
80
DNS health
85
Network security
100
GDPR outside view
33
Average
74

Not counted

  • NIS2 outside view: Re-weights evidence from the TLS, email, DNS, network and hygiene checks, so counting it would count that evidence twice. Shown on its own.
  • OffSeq Observations: An AI reading of the site, useful context but not reproducible evidence. Shown on its own.

Findings that cap the score at 49

Each of these is serious on its own, so while any is present the site cannot rate better than high risk, however good the other checks are.

  • The certificate is not trusted by browsers
  • The website is not served over HTTPS
  • A database, remote desktop, file-sharing or Telnet service is reachable from the internet
  • The page loads a script from a compromised source
  • The domain registration has expired
  • SPF authorises every server to send mail as the domain

Partial scans

When the site blocks Guard or most checks cannot run, the score covers only the checks that ran (usually DNS and email), is capped at 75 and is shown as partial, without a risk level.

Risk levels

  • Critical0–25
  • High26–49
  • Medium50–75
  • Low76–100

Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

Holidu GmbH holds a strong market position as a vacation rental specialist in Europe, targeting consumers looking for diverse holiday accommodations. The business model revolves around an online marketplace and booking platform, generating revenue likely through commissions and partnerships. The company maintains a broad partnership ecosystem with localized domains for multiple countries, enhancing market reach. The platform's use of advanced filtering and verified listings provides competitive advantages. Growth indicators include extensive content, high user ratings, and consistent branding. The company appears to focus on quality user experience and trust-building through star host badges and clear policies. However, direct contact information and detailed corporate data are not prominently displayed, which could be improved for enhanced credibility.

Security posture

The website demonstrates a mature security posture with HTTPS enforced, comprehensive security headers, and no visible exposure of sensitive data. The use of cookie consent mechanisms and GDPR-compliant privacy policies reflects good data protection practices. However, the absence of explicit security policies, incident response contacts, and vulnerability disclosure mechanisms indicates areas for improvement. The inclusion of third-party tracking and advertising scripts necessitates ongoing security audits to mitigate risks. Overall, the platform shows a solid foundation in security but would benefit from increased transparency and formalized security documentation to enhance trust and compliance readiness.

Recommendations

  1. Publish a dedicated security policy and incident response plan accessible to users.
  2. Implement and publicize a vulnerability disclosure program or security.txt file.
  3. Provide clear contact channels for security incidents, such as security@ or abuse@ emails.
  4. Regularly review and update third-party scripts to minimize security risks.
  5. Enhance transparency on data retention and processing practices to strengthen privacy compliance.
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Holidu GmbH
Description
Riesige Auswahl an hochwertigen Ferienhäusern, Ferienwohnungen, Fincas. Geprüfte Unterkünfte zum besten Preis mit Vertrauen buchen. Ferienhäuser mit Pool, Meerblick, kinderfreundlich, haustierfreundlich. Spezialist für die schönsten Urlaubsregionen Europas.
Key services
Vacation rental search and booking, Verified accommodation listings, Filters for amenities and preferences
Content quality
excellent
Branding
consistent

Technology

Stack
JavaScript, Google Analytics, Google Tag Manager, Bing Ads, Taboola, ThumbmarkJS fingerprinting
Frameworks
React, Tailwind CSS
Platforms
Web
Performance
moderate
Mobile
excellent
Accessibility
good
SEO
good

Security

Observed score
85/100
Good practices seen
  • HTTPS enforced
  • Cookie consent implemented
  • No exposed sensitive data in HTML
  • Use of security headers

Analytics and tracking

Services
Google Analytics, Google Tag Manager, Bing Ads
Tracking level
extensive
Privacy practices
good

Advertising

Ad networks
Bing Ads, Taboola
Tracking pixels
Bing Ads, Taboola
Marketing tools
Bing Ads, Taboola
Transparency
good

Site quality

Design
excellent
User experience
excellent
Content relevance
excellent
Navigation
excellent
Professionalism
excellent
Trustworthiness
high

Key observations

  1. Website is a professional vacation rental platform targeting European markets.
  2. Content is rich, well-structured, and localized for Austria (de-AT).
  3. Strong use of modern web technologies and tracking tools.
  4. Privacy and cookie policies are present and GDPR compliant.
  5. No direct contact emails or phone numbers found in the HTML content.
  6. WHOIS data is unavailable, limiting domain trust assessment.
  7. No signs of malware or phishing detected.
  8. No WAF or blocking mechanisms detected.
Technical notes

Notes

The website is built using modern web technologies including React and Tailwind CSS, ensuring responsive and accessible design. It integrates multiple analytics and advertising platforms such as Google Analytics, Bing Ads, and Taboola, indicating a sophisticated marketing infrastructure. Performance is moderate with asynchronous script loading and font optimization. The absence of a detected CMS suggests a custom or headless architecture. Technical risks include reliance on multiple third-party scripts which require vigilant security management. Opportunities exist to improve technical documentation and streamline third-party dependencies to reduce potential attack surfaces.
Standards and sources

Reference chips under each finding point to the standard, regulation or specification the finding relates to. They are taken from the official datasets below and mapped conservatively: a finding with no defensible link shows none. NIS2 and GDPR references mark where a finding is relevant evidence, not a compliance verdict. Implementing Regulation (EU) 2024/2690 binds digital infrastructure and digital service providers; for other entities it is the most detailed public reading of the Article 21 measures. WCAG, EN 301 549, European Accessibility Act and Web Accessibility Directive references name the requirement an automated accessibility rule relates to; they are not a conformance verdict.

Retrieved 2026-10-25

Earlier scans of this domain

  1. 61/100Medium21 findingsView report
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